feat: pre-fill doctor name with default NPI provider in Lab RX popup

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/Frontend/src/components/chart/lab-rx-modal.tsx

@@ -175,7 +175,7 @@ export function LabRxModal({ open, onClose, patient }: Props) {
   const openRx = (t: LabRxTemplate) => {
     if (renamingId !== null) return;
     setRxTemplate(t);
-    setRx(EMPTY_RX);
+    setRx({ ...EMPTY_RX, doctorName: providers[0]?.providerName ?? "" });
   };
 
   const startRename = (e: React.MouseEvent, t: LabRxTemplate) => {